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Add support for the .tiff file format #7

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Add support for the .tiff file format #7

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64 changes: 63 additions & 1 deletion Fastimage.php
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Original file line number Diff line number Diff line change
Expand Up @@ -68,6 +68,9 @@ public function getType()
return $this->type = 'jpeg';
case chr(0x89).'P':
return $this->type = 'png';
case "II":
case "MM":
return $this->type = 'tiff';
default:
return false;
}
Expand All @@ -90,7 +93,9 @@ private function parseSize()
case 'bmp':
return $this->parseSizeForBMP();
case 'jpeg':
return $this->parseSizeForJPEG();
return $this->parseSizeForJPEG();
case 'tiff':
return $this->parseSizeForTiff();
}

return null;
Expand Down Expand Up @@ -182,6 +187,63 @@ private function parseSizeForJPEG()
}
}

private function parseSizeForTiff()
{
$byte_order = $this->getChars(2);

switch ( $byte_order ) {
case 'II':
$short = 'v';
$long = 'V';
break;
case 'MM':
$short = 'n';
$long = 'N';
break;
default:
return false;
break;
}

$this->getChars(2);

$offset = current(unpack($long,$this->getChars(4)));

$this->getChars($offset-8);

$tag_count = current(unpack($short,$this->getChars(2)));

for($i = $tag_count; $i > 0; $i--) {

$type = current(unpack($short,$this->getChars(2)));
$this->getChars(6);
$data = current(unpack($short,$this->getChars(2)));

switch ($type) {
case 0x0100:
$width = $data;
break;
case 0x0101:
$height = $data;
break;
case 0x0112:
$orientation = $data;
break;
}

if ( isset($width) && isset($height) && isset($orientation) ) {

if($orientation >= 5) {
return [$height,$width];
}

return [$width,$height];
}

$this->getChars(2);
}
}


private function getChars($n)
{
Expand Down